jyvikoandClaude Opus 5.5 e0d5adba23 Engine: each command lists what it needs, and execute checks it first ...

CommandSpec gains `requires: &[Requirement]` (crates/engine/src/requirement.rs): an open
design, geometry, nodes, a mesh, something to analyse, materials and sections for the
elements, sets, the definition an edit or delete acts on, a step, a result. Session::execute
checks them before running, so a command missing one fails at once with no partial work,
naming each missing piece and the toolbar entry that provides it ("Needs a material —
Properties › Material"). Requirements are real prerequisites (the model's own reference
checks and model.check's rules), never a workflow order. engine.commands / list_commands
list them.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UhhZMBTviDQxZvwnyP89fo

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..

samples

engine: crank-arm sample, a bicycle crank swept all-hex and solved

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src

Engine: each command lists what it needs, and execute checks it first

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Cargo.toml

engine: samples can build their geometry from a SolidCraft script

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